Point-to-Point Protocol

The Point-to-Point Protocol, or PPP, is commonly used to establish a
connection between two computers using a phone line. Many ISPs use PPP when
providing customers with dial-up access, where it has largely superseded an
older protocol known as SLIP.

PPP is a low-level communications protocol used between two connected hosts.
PPP was designed to act as a layer 2 protocol for the TCP-IP protocol suite
over synchronous modem links, as a replacement for the non-standard layer 2
protocol SLIP. However, other protocols can also be carried over PPP. (Layer
2 is the Data Link layer of the OSI model).

PPP also provides hooks for automatically configuring the network interfaces
at each end (setting IP address, default gateway, etc.).

PPP is described by IETF RFC 1661. Numerous documents on PPP have been
published through the RFC process since July 1990, including various
authentication, encryption and compression methods and the use of PPP in
conjunction with other network protocols

RFC 2516 describes PPPoE, a method for transmitting PPP over Ethernet which
is sometimes used with DSL.

RFC 2634 describes the use of ATM Adaptation Layer 5 (AAL5) for framing PPP
encapsulated packets known as PPPoA or PPPoATM for PPP over ATM.

RFC 1994 describes CHAP, the challenge handshake authentication protocol
which is commonly used when establishing dialup connections with ISPs.

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